Ultrasound single-element non-contacting inspection system
US7262861B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2004 |
| Grant date | Aug 28, 2007 |
| Priority date | — |
| Expiry date | Mar 4, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0421
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A laser ultrasonic inspection apparatus and method which enables remote sensing of thickness, hardness, temperature and/or internal defect detection is disclosed. A laser generator impinges a workpiece with light for generating a thermo-elastic acoustic reaction in a workpiece. A probe laser impinges the workpiece with an annularly-shaped probe light for interaction with the acoustic signal in the workpiece resulting in a modulated return beam. A photodetector having a sensitive region for detecting an annularly-shaped fringe pattern generated by an interaction of a reference signal and with the modulated return beam at said sensitive region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.